Drop-in replacement for A4984Proprietary Adaptive Percent Fast Decay optionLow RDS(on)outputsSingle supplyMicrostepping up to 32 microsteps per full stepFull torque step modesShort-to-ground protectionShorted load protectionShort-to-battery protectionFault outputLow current Sleep mode, < 10 μANo smoke no fire (NSNF) compliance (ET package)Thin profile QFN and_TSSOP packagesThermal shutdown circuitrySynchronous rectification for low power dissipationInternal UVLOCrossover-current protectionDESCRIPTIONThe A5984 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors from full-step up to 1/32 step modes. Step modes are selectable by MSx logic inputs. It has an outputdrive capacity of up to 40 V and_±2 A. A5984 introduces a proprietary Adaptive Percent Fast Decay(APFD) algorithm to optimize the current waveform over awide range of stepper speeds and_stepper motor characteristics. APFD adjusts on-the-fly the amount of fast decay during aPWM cycle to keep current ripple at a low level over thevarious operating conditions. This adaptive feature improves performance of the system resulting in reduced audible motornoise, reduced vibration, and_increased step accuracy. The translator is the key to the easy implementation of theA5984. Simply inputting one pulse on the STEP input drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A5984 interface is an ideal fit for applications where acomplex microprocessor is unavailable or is overburdened. The ET package meets customer requirements for no smokeno fire (NSNF) designs by adding no-connect pins between critical output, sense, and_supply pins. So, in the case of apin-to-adjacent-pin short, the device does not cause smokeor fire. Additionally, the device does not cause smoke or fire when any pin is shorted to ground or left open.